SB20260424125 - Heap-based buffer overflow in OpenVPN Data Channel Offload driver for Windows

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Main Vulnerability Database SB20260424125

SB20260424125 - Heap-based buffer overflow in OpenVPN Data Channel Offload driver for Windows

Published: April 24, 2026

Security Bulletin ID SB20260424125
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Heap-based buffer overflow (CVE-ID: CVE-2026-2738)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to a heap-based buffer overflow in the ovpn-dco-win data channel offload driver when processing encrypted packets from a connected OpenVPN server with data epoch keys support. A remote user can send crafted encrypted packets to cause a denial of service.

The issue occurs when connecting to an OpenVPN 2.7.0 server or another implementation that supports data epoch keys.


Remediation

Install update from vendor's website.

References